Substorm topology in the ionosphere and magnetosphere during a flux rope event in the magnetotail
International audience On 13 August 2002, at ~23:00 UT, about 10 min after a substorm intensification, Cluster observes a flux rope in the central magnetotail, followed by a localised fast flow event about oneminute later. Associated with the flux rope event, a traveling compression region (TCR) is...
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Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2006
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Online Access: | https://hal.archives-ouvertes.fr/hal-00330050 https://hal.archives-ouvertes.fr/hal-00330050/document https://hal.archives-ouvertes.fr/hal-00330050/file/angeo-24-735-2006.pdf |
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Open Polar |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
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[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Amm, O. Nakamura, R. Frey, H. U. Ogawa, Y. Kubyshkina, M. Balogh, A. Rème, H. Substorm topology in the ionosphere and magnetosphere during a flux rope event in the magnetotail |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience On 13 August 2002, at ~23:00 UT, about 10 min after a substorm intensification, Cluster observes a flux rope in the central magnetotail, followed by a localised fast flow event about oneminute later. Associated with the flux rope event, a traveling compression region (TCR) is seen by those Cluster spacecraft which reside in the lobe. In the conjugate ionospheric region in Northern Scandinavia, the MIRACLE network observes the ionospheric equivalent currents, and the electron densities and electric fields are measured by the EISCAT radar along a meridional scanning profile. Further, the auroral evolution is observed with the Wideband Imaging Camera (WIC) on the IMAGE satellite. We compare in detail the substorm evolution as observed in the ionosphere and in the magnetosphere, and examine whether topological correspondences to the flux rope event exist in the ionospheric signatures. The large-scale mapping of both the location and the direction of the flux rope to the ionosphere shows an excellent correspondence to a lens-shaped region of an auroral emission minimum. This region is bracketed by an auroral region equatorward of it which was preexisting to the substorm intensification, and a substorm-related auroral region poleward of it. It is characterised by reduced ionospheric conductances with respect to its environment, and downward field-aligned current (FAC) observed both in the magnetosphere and in the ionosphere. As determined from the ionospheric data, this downward FAC area is moving eastward with a speed of ~2 km s -1 , in good agreement with the mapped plasma bulk velocity measured at the Cluster satellite closest to that area. Further southwestward to this leading downward FAC area, a trailing upward FAC area is observed that moves eastward with the same speed. The direction of the ionospheric electric field permits a current closure between these two FAC areas through the ionosphere. We speculate that these FAC areas may correspond to the ends of the flux rope in its symmetry ... |
author2 |
Finnish Meteorological Institute (FMI) Space Research Institute of Austrian Academy of Sciences (IWF) Austrian Academy of Sciences (OeAW) Space Sciences Laboratory Berkeley (SSL) University of California Berkeley University of California-University of California SolarTerrestrial Environment Laboratory Nagoya University Institute of Physics Czech Academy of Sciences Prague (CAS) Space and Atmospheric Physics Group London Blackett Laboratory Imperial College London-Imperial College London Centre d'étude spatiale des rayonnements (CESR) Observatoire Midi-Pyrénées (OMP) Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées |
format |
Article in Journal/Newspaper |
author |
Amm, O. Nakamura, R. Frey, H. U. Ogawa, Y. Kubyshkina, M. Balogh, A. Rème, H. |
author_facet |
Amm, O. Nakamura, R. Frey, H. U. Ogawa, Y. Kubyshkina, M. Balogh, A. Rème, H. |
author_sort |
Amm, O. |
title |
Substorm topology in the ionosphere and magnetosphere during a flux rope event in the magnetotail |
title_short |
Substorm topology in the ionosphere and magnetosphere during a flux rope event in the magnetotail |
title_full |
Substorm topology in the ionosphere and magnetosphere during a flux rope event in the magnetotail |
title_fullStr |
Substorm topology in the ionosphere and magnetosphere during a flux rope event in the magnetotail |
title_full_unstemmed |
Substorm topology in the ionosphere and magnetosphere during a flux rope event in the magnetotail |
title_sort |
substorm topology in the ionosphere and magnetosphere during a flux rope event in the magnetotail |
publisher |
HAL CCSD |
publishDate |
2006 |
url |
https://hal.archives-ouvertes.fr/hal-00330050 https://hal.archives-ouvertes.fr/hal-00330050/document https://hal.archives-ouvertes.fr/hal-00330050/file/angeo-24-735-2006.pdf |
genre |
EISCAT |
genre_facet |
EISCAT |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.archives-ouvertes.fr/hal-00330050 Annales Geophysicae, European Geosciences Union, 2006, 24 (2), pp.735-750 |
op_relation |
hal-00330050 https://hal.archives-ouvertes.fr/hal-00330050 https://hal.archives-ouvertes.fr/hal-00330050/document https://hal.archives-ouvertes.fr/hal-00330050/file/angeo-24-735-2006.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1766400476252733440 |
spelling |
ftccsdartic:oai:HAL:hal-00330050v1 2023-05-15T16:04:50+02:00 Substorm topology in the ionosphere and magnetosphere during a flux rope event in the magnetotail Amm, O. Nakamura, R. Frey, H. U. Ogawa, Y. Kubyshkina, M. Balogh, A. Rème, H. Finnish Meteorological Institute (FMI) Space Research Institute of Austrian Academy of Sciences (IWF) Austrian Academy of Sciences (OeAW) Space Sciences Laboratory Berkeley (SSL) University of California Berkeley University of California-University of California SolarTerrestrial Environment Laboratory Nagoya University Institute of Physics Czech Academy of Sciences Prague (CAS) Space and Atmospheric Physics Group London Blackett Laboratory Imperial College London-Imperial College London Centre d'étude spatiale des rayonnements (CESR) Observatoire Midi-Pyrénées (OMP) Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées 2006-03-23 https://hal.archives-ouvertes.fr/hal-00330050 https://hal.archives-ouvertes.fr/hal-00330050/document https://hal.archives-ouvertes.fr/hal-00330050/file/angeo-24-735-2006.pdf en eng HAL CCSD European Geosciences Union hal-00330050 https://hal.archives-ouvertes.fr/hal-00330050 https://hal.archives-ouvertes.fr/hal-00330050/document https://hal.archives-ouvertes.fr/hal-00330050/file/angeo-24-735-2006.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.archives-ouvertes.fr/hal-00330050 Annales Geophysicae, European Geosciences Union, 2006, 24 (2), pp.735-750 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2006 ftccsdartic 2021-10-24T20:41:42Z International audience On 13 August 2002, at ~23:00 UT, about 10 min after a substorm intensification, Cluster observes a flux rope in the central magnetotail, followed by a localised fast flow event about oneminute later. Associated with the flux rope event, a traveling compression region (TCR) is seen by those Cluster spacecraft which reside in the lobe. In the conjugate ionospheric region in Northern Scandinavia, the MIRACLE network observes the ionospheric equivalent currents, and the electron densities and electric fields are measured by the EISCAT radar along a meridional scanning profile. Further, the auroral evolution is observed with the Wideband Imaging Camera (WIC) on the IMAGE satellite. We compare in detail the substorm evolution as observed in the ionosphere and in the magnetosphere, and examine whether topological correspondences to the flux rope event exist in the ionospheric signatures. The large-scale mapping of both the location and the direction of the flux rope to the ionosphere shows an excellent correspondence to a lens-shaped region of an auroral emission minimum. This region is bracketed by an auroral region equatorward of it which was preexisting to the substorm intensification, and a substorm-related auroral region poleward of it. It is characterised by reduced ionospheric conductances with respect to its environment, and downward field-aligned current (FAC) observed both in the magnetosphere and in the ionosphere. As determined from the ionospheric data, this downward FAC area is moving eastward with a speed of ~2 km s -1 , in good agreement with the mapped plasma bulk velocity measured at the Cluster satellite closest to that area. Further southwestward to this leading downward FAC area, a trailing upward FAC area is observed that moves eastward with the same speed. The direction of the ionospheric electric field permits a current closure between these two FAC areas through the ionosphere. We speculate that these FAC areas may correspond to the ends of the flux rope in its symmetry ... Article in Journal/Newspaper EISCAT Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |